Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 17, Problem 2SQ
How many wires are required for a two-wire control device?
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Consider the circuit shown below,
Vac 0-
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Vdc
ли
R1
R2
where R₁ = 2.2KQ, R₂ = 4.7KQ, C = 0.1uF, Vdc = +5V, and Vac = 3V peak f = 1KHz.
• Use superposition to calculate the DC voltage at point X; VDC =
•
Use superposition to calculate the AC (peak) voltage at point X; VAC =
Q2/ An air-filled rectangular waveguide is to be used to transmit signals at a carrier frequency of 6 GHz. Choose its dimensions so that the cutoff frequency of the dominant TE mode is 80% of the carrier frequency 6GHz and that of the TE01 is 70%.
A three-phase half-wave converter in Figure 2
is operated from a three-
phase Y-connected 208-V, 60-Hz supply and the load resistance is R = 10 2. If it
is required to obtain an average output voltage of 50% of the maximum possible
output voltage, calculate
(a) the delay angle a.
(b) the rms and average output currents.
(c) the average and rms thyristor currents.
(d) the rectification efficiency.
a
T₁
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Chapter 17 Solutions
Electric Motor Control
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